A183681 Number of (n+1)X(n+1) binary arrays with every 2X2 subblock nonsingular

6, 32, 256, 3472, 73344, 2542368, 140090240, 12503757968, 1787244586880, 411927241028352, 152442345546739968, 90819596095626887104, 86960426240537811217920, 133963874202574308172821152

Offset

1,1

Comments

Diagonal of A183688

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for 3X3
..0..1..0....0..1..1....1..0..1....1..1..0....1..1..1....1..1..1....0..1..0
..1..1..1....1..0..1....0..1..0....1..0..1....1..0..1....1..0..1....1..0..1
..0..1..0....1..1..1....1..0..1....1..1..0....1..1..1....1..1..0....1..1..1

Crossrefs

Sequence in context: A221540 A331878 A121120 * A326985 A350485 A350109

Adjacent sequences: A183678 A183679 A183680 * A183682 A183683 A183684

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved